I know plenty of lads in their 70's/80's enjoying life and retirement. Travelling, boozing, golf, etc. If you look after yourself you can be very healthy later in life.
It's easy to say when you are young that you're not bothering about being old and wrinkly. I bet when you're 60 you wont be saying I've only got 5 years left in me. You'll be saying you've at least another 20 years.